How to Buy an Exercise Ball

This article was co-authored by Michele Dolan. Michele Dolan is a BCRPA certified Personal Trainer in British Columbia. She has been a personal trainer and fitness instructor since 2002.

There are 12 references cited in this article, which can be found at the bottom of the page.

Exercise balls, also known as Swiss balls, stability balls or fitness balls, are fun, inexpensive tools that can improve muscular strength, endurance, balance, and flexibility. When purchasing an exercise ball, it is important to consider many things, such as the size, durability, and firmness of the ball. Carefully considering these aspects will ensure that you get an exercise ball tailored for your specific needs, and you will be on your way to improving your all-around health and meeting your fitness goals.

Choose an extra-small ball if you are up to 5’ (152.4 cm) tall. Exercise balls are available in different sizes, based on the diameter of the ball when fully inflated. The correct ball size is selected based on your height. So if you are under 5', the extra-small ball with a diameter of 45 cm (17.7 in) will probably work best for you. The small diameter of these balls means they are also great for children.[1]

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Go for a small ball if you are 5’1”-5’8” (155-173cm) tall. Small fitness balls have a diameter of 55 cm (21.7 in). The goal is to keep your legs at a 90-degree angle, so getting a bigger ball could have a negative effect on your form.[2]

Try a medium ball if you are 5’9”-6’2” (175-188 cm) tall. With a diameter of 65 cm (25.6 in), this is the most common-sized ball. It will help you to maintain the correct posture and foot position for exercise-ball based workouts.[3]

You may need a larger ball if you have back problems or if you have long legs for your height. You may also need a larger ball if you are planning on using it for yoga, stretching, or as a seat.

Opt for a large ball if you are 6’3”-6’7” (190-201 cm) tall. This has a diameter of 75 cm (29.5 in); using a smaller ball will make it much easier for you to balance, which in turn will make the exercises easier. This may seem like a positive, but it will actually prevent you from getting the optimal use from your ball.[4]

Look for an extra-large ball if you are 6’8” (203 cm) or taller. Extra-large balls, with a diameter of 85 cm (33.5 in) may need to be special-ordered. However, this extra step is worth it as using a ball that is too small will prevent an effective workout and could cause a lower-back strain.[5]

Choose a ball with a high weight limit. All exercise balls should be labeled with an anti-burst rating that indicates the maximum weight that the ball can safely support. A higher rating will be necessary if you plan on using an additional weight, such as dumbbells, in your workout. An anti-burst rating of 500 kilograms (1,102.31 lb) or greater is best.[7]

Most exercise balls will have two ratings: dynamic and static. The static weight rating is the maximum weight the ball can support if you only sit on the ball. Dynamic weight rating considers bouncing, free weights and movement. If you are planning to use the ball for exercise, then the dynamic weight is the crucial rating.[8]

Even a highly rated ball made of anti-burst material can fail if it is damaged, used incorrectly or not properly maintained.

Choose the texture you like best. Exercise balls come in a variety of textures. The smoother the surface, the easier the ball will slide as you use it. It is important to note that smooth surface combined with sweat will increase the risk of falling from the ball. Some yoga balls are textured to prevent slipping and to stick better to the floor. Choosing the right texture is a matter of taste so test out a few and determine which texture you prefer.

Make sure to consider the texture of the floor you will be placing the ball on as well. If the surface is very smooth, such as vinyl or hardwood flooring, then the ball may slip more easily.

Buy it in a store if you want to test it first. Most sporting goods stores carry exercise balls, and they can also be found in gyms, yoga studios, and the sports sections of department stores. Going in person will allow you the chance to see if the size and material are right for you.

Buy the ball online if you prefer. Exercise balls can also be bought online, but make sure you know the size and material you need before you place your order. Sites such as Amazon or Target.com carry exercise balls. If you are looking for a more specialized site, visit swissballs.com or gaiam.com which focus on exercise balls and other workout equipment. If you need an extra-large ball, buying it online may be easier as many stores do not carry that size.

Check the return policy. Whether you buy in-store or online, make sure you can return the ball if the size, texture, or material don’t work for you. Remember that some companies will only allow returns within the first 30 days after purchase.

Inflate the ball. You can use either a hand or electric pump. Initially inflate the ball to about 80% of its diameter. After 24 hours, inflate it to its full size. Do not use the ball during this time. The ball will stretch after being partially inflated, and letting it sit overnight will ensure it reaches its correct size and shape when completely filled.[9]

To judge the correct size, use masking tape to mark the wall at the same distance from the floor as the desired diameter. When the ball is fully inflated, its height will be the same as its diameter. When the ball reaches the mark, you will know the ball is fully inflated.[10]

The firmer the fitness ball, the harder the exercise will be. Beginners might find it easier to slightly deflate the ball. As you gain strength, you can further inflate the ball. Keep in mind that deflating the ball will lower the effectiveness of the exercises.[11]

Test the ball out at home. By testing the ball before you begin to exercise, you will ensure that it is the correct size and will work for you. Sit on top of the ball, with your side facing a mirror. Place your feet flat on the ground; this will help you maintain proper balance. Your hips and knees should form a 90-degree angle; this is the optimal position for exercising with your ball.[12]

If you need to slide forward for your feet to touch the ground, the ball is not the correct size.

If your exercise ball is too small, you will slump forward. This will prevent you from effectively working your core muscles and it may cause a lower-back strain. If the ball is too tall, it is easier to maintain stability, and this will decrease the effectiveness of the exercise.

Pregnancy does not change the size of ball to use, which is based on your height. However, if you are in your third trimester, you might have trouble getting up from a low seat, so consider using a ball one size up from your usual.

To buy an exercise ball, choose a small ball if you're between 5 foot 1 and 5 foot 8. If you're between 5 foot 9 and 6 foot 2, try a medium ball. Additionally, pick a ball made of anti-burst material, with a high weight limit. You should also consider what texture you want, like a smooth surface if you want the ball to slide easily. Alternatively, choose a textured surface that will stick better to the floor if you plan to use the ball for exercise.